by 2SSophie
Usually, after opening Pixelmator Pro, it works only once. Then, when applying the exact same process, I can't change the colours any more.

My guess would be that you are trying to change color without activating thumb (a control, which you click to change color) first - this might happen if you change tools while Colors window is still open. Turning off existing Colors window and activating thumb again should sort this out :)

To avoid these tricky situations, I would suggest closing Colors window every time you have finished picking color.

P.S. For now, you need to drag that file directly into the Gradients palette. Dragging single presets onto the icon should now work and we'll be adding a fix for adding preset collections by dragging and dropping them onto the icon, as well.

One thing to point out is that if you open Pixelmator files with Pixelmator Pro and which include gradients created in Pixelmator they can easily be added to Pro by clicking on the + in the gradients palette. I've now moved pretty much all of my gradients from Pixelmator into PPro